Screw to fix a prosthesis on a dental implant, surgical driver, kit and torque key (as amended)

A surgical driver wherein it comprises:

• a work part comprising:
• fastening means with a shape which combines with the shape of the head of the screw, the fastening means comprising:
• a housing with the shape of a mainly spherical cavity, having a larger diameter than the spherical protruding area of the screw to be fastened;
• a plurality of anchoring grips with the shape of a curved-concave protruding area, featuring flaps located in the equator of the housing, arranged to fit in the sunken areas;
• a handling part comprising a pin-shaped fix grip to form the handle of the surgical driver;
• a mandrel-shaped connecting part to form universal connecting means arranged to connect the surgical driver to a dentist's ratchet.

A torque key, wherein it comprises:

• a work part comprising:
• dragging means with a shape which combines with that of the head of the screw, the dragging means comprising:
• a housing with the shape of a mostly spherical cavity, having a larger diameter than the spherical protruding area of the screw to be fastened;
• a plurality of anchoring grips with the shape of a curved-concave protruding area, located in a equator of the housing, arrange to fit in the sunken areas;
• a pin-shaped handling part to form a handle of the torque key;
• a mandrel-shaped connecting part to form universal connecting means arranged to connect the torque key to a dentist's ratchet.